Fizika Tverdogo Tela, 2025 Volume 67, Issue 4,Pages 690–696(Mi ftt11442)
Ferroelectricity
Microstructure, dielectric and ferroelectric characteristics of 0.1BiFeO$_3$–0.9PbFe$_{0.5}$Nb$_{0.5}$O$_3$ multiferroic ceramics at temperatures of 10–850 K
Abstract:
The microstructure, dielectric, ferroelectric and piezoelectric characteristics of the multiferroic ceramics 0.1BiFeO$_3$–0.9PbFe$_{0.5}$Nb$_{0.5}$O$_3$ have been studied. It is shown that ceramics are impurity-free and have a homogeneous grain structure. When analyzing the $\varepsilon'(T,f)$ and $\varepsilon''(T,f)$ dependences of the sample at $T$ = (10–850) K, it was found that 0.1BiFeO$_3$–0.9PbFe$_{0.5}$Nb$_{0.5}$O$_3$ is a relaxor ferroelectric; a magnetodielectric effect appears during the magnetic phase transition, and at $T>$ 450 K, a significant contribution to the dielectric response begins to be made by the Maxwell–Wagner polarization and the corresponding dielectric relaxation. It was revealed that at room temperature, 0.1BiFeO$_3$–0.9PbFe$_{0.5}$Nb$_{0.5}$O$_3$ ceramics, unlike BiFeO$_3$ and PbFe$_{0.5}$Nb$_{0.5}$O$_3$, is characterized by high values of the real part of the complex permittivity, $\varepsilon'\approx$ 9000, dielectric controllability, $K\approx$ 40% and a piezoelectric coefficient, $d_{33}\approx$ 340 pm/V.
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